.form_style{
    background: url(../../resource/images/bg_login1.png) no-repeat; 
    height: -webkit-fill-available;
    height: fill-available;
    width: 100%;
    // -moz-background-size:100% 100%;  
    // background-size:100% 100%; 
    background-size: cover;
    position: absolute;
    bottom:fixed;
    
    .btn_bind{
        span{
            font-size: 16px;
        }
    }

}